— ABB ME A SUREMENT & ANALY TICS | DATA SHEET
Portable NGCNatural gas chromatograph
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—Measurement made easyThe NGC combines simplicity with low installation costs and unmatched performance, making it the ideal solution for natural gas custody transfer. The Portable NGC is a natural gas chromatograph designed for installation in a vehicle, allowing it to be used for real-time analysis on any site that can be accessed by vehicle.
—The NGC is easily powered, either from the vehicle’s 12 V DC system or from a 110 V AC inverter. Its low power operation means you can maintain continuous power on the unit, thus keeping it at operating temperature and assuring it is ready for immediate use on site.
From the spot analysis the following are calculated:• Relative density• Heating value• VOS (velocity of sound)• GPM (gallons of liquid per thousand cubic feet)• Wobbe index
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Introduction
This data can be used for flow computers, RTU’s, gas
accounting systems, and SCADA systems for the energy, AGA3,
7, 8, and 10 calculations at the meter site. This data output can
be a CSV file format so that analysis data systems can easily
incorporate the information. The number of runs and the
number of averages can be selected.
The averaged output can be formatted to be accepted by a 3rd
party gas accounting software system, allowing automatic
downloads of the analysis data. Analysis done
on site is valuable because:
• Transportation of DOT regulated gas cylinders is avoided
• Time and cost of subsequent laboratory analysis
• Problems with sample handling
• Economic solution for gas quality measurement when the
gas volumes are too low to justify on-line chromatography
—
Description
The truck is moved as close to the sample point as is practical.
A flexible sample line is then uncoiled and attached to the
probe in the flowing natural gas pipeline. If the dew point of
the gas or the weather demands it, this flexible tubing must
be heated. A sample of the gas is extracted from the probe in
the line, purged through the flexible line and then transported
to the analyzer. There it is processed for particle removal and
phase integrity, injected onto the chromatographic columns
where component separation occurs. These components are
then quantified by peak integration and concentration is
calculated. The other data of interest is then calculated from
these concentrations.
The Portable NGC analyzes each sample utilizing established
chromatographic techniques. The resulting information
consists of mole percent values for the following:
• “Air” (Contains N2, Ar, CO and O2 but not CO2)
• C1 CO2 C2 C3 IC4 NC4
• NeoC5 IC5 NC5 C6+
• As an option, H2S, up to 1200ppm, (With an MDQ of
300ppm) may be added to this analysis
The NGC8206 measures a C6+ (back flushed) peak. Users may
input the results of a comprehensive lab analysis that reflects
the split or ratio of C6 through C10 components. This ratio can
be used in subsequent analyses and energy calculations.
The NGC8209 measures a C9+ (back flushed) peak. Users may
input the results of a comprehensive lab analysis that reflects
the split or ratio of C9 through C12 components. This ratio can
be used in subsequent analyses and energy calculations.
Calculated values include
• Relative density (specific gravity)
• Btu/CV (heating) value
• GPM (gallons of liquid per thousand cubic feet)
• Wobbe index
Portable NGC8206
Portable NGC8209
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Standard features
Modular design includes
• Portable GC interface allows user analysis customization
• Modular software – application based plug in software
modules
• Manifold module (internal tubing now replaced
by manifold)
• Analysis sections contain stream selection solenoids,
temperature and pressure regulation, 32 bit digital detector
electronics, replaceable column / valve modules and a low
power 32 bit digital controller, using Windows CE® (internal
to GC unit)
• Microsoft® Windows® based man-machine interface
software (PCCU)
• USB MMI port connectivity
• Ethernet connectivity
• Lithium battery-backed RAM
• Two remote serial digital communications ports; one local
port
• Comprehensive diagnostics and wizards available to users
• Audit-quality historical data; date and time stamped
• Operational fault/warn alarms available
• Detectors - constant temperature, glass encapsulated
thermister beads for rugged service and long life; will not
burn out on loss of carrier
• 10 port valves have no moving metal parts in each
analysis unit
• Low utility usage - low-power, low-carrier, no instrument air
required
• On demand or scheduled automatic calibration and
diagnostics
—
Equipment
The equipment used for this analysis consists
of the standard NGC8206 mounted in a powder-coated box.
The equipment used for this analysis consists of the standard
NGC8209 mounted in a black case. It is recommended that the
unit be left in an operational mode while transporting.
All the valves, gauges, inlet ports, and PCCU32 (the laptop
driven man-machine interface) connectors are bulkhead
mounted on panel to provide the technician with ready access.
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Historical data
The Portable NGC is designed to retain historical data. This
data can be used for custody transfer needs, verify transmitter
operation over time, and provide a limited data backup for
communication link reliability.
In addition, various CSV file outputs are available to download
the analysis data into spreadsheet based company specific
data sheets, and outputs to 3rd party gas accounting
packages.
The default¹ memory configuration provides the most recent
480 analysis cycles containing:
• Normalized components
• Un-normalized components
• Ideal Btu/CV
• Real Btu (wet and dry) / CV (superior and inferior)
• Relative density (specific gravity)
• Density
• GPM
• Wobbe index
• Alarms
Stream averages for the (default¹) 840 last hours, 35 last days
and the most recent last month analyses. Operational
Parameters for the (default¹) last 480 cycles (Diagnostics
Report):
• Selected peak times
• Selected peak areas
• Ideal Btu/CV
• Carrier regulator pressure
• Oven temperature
• Ambient temperature
• Sample pressure
• Detector noise values
• Detector balance values
Audit logs (default¹)
• Last 480 alarms
• Last 480 events
Data retained by the Portable NGC can be collected via a
remote communication link or by the laptop PC local operator
interface PCCU 32.
—
default
The default memory configuration will provide for the data storage
above. Users may reallocate the memory that is available.
—
Available options
• Sample and GC Rotometers
• 120/240 V AC / 24 V DC to 12 V DC power supply
• Modular Sample System for Non-pipeline quality natural
gas and Sample transport lag-time needs: Type 4 w/ liquid
shut-off
• Temperature Compensation Probes:
• Fixed
• Retractable
• Regulators, carrier and calibration blend
• Start up/calibration/validation gas sample (+2% Cal Blend)
• Export crating
• Tool kit
• Various maintenance kits
• On board digital ¼ VGA display with multiple screen access
• USB (Host and Client) and Ethernet ports
• SD memory cards
• Feed-Through heater
• Heat trace internal and external tubing
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Specifications
Portable NGC Specifications
Dimensions
Weight
Weatherproof construction No classification No classification
Carrier gas analysis cycle analysis cycle
Analysis time
(cycles may be scheduled by user)
(cycles may be scheduled by user)
Repeatability range range
Temperature range (storage)
Temperature range (normal)
Moisture
Supply voltage
Power consumption
Certifications General purpose General purpose
Communications supported
Two serial digital ports, software selectable
client) and Ethernet ports.
Two serial digital ports, software selectable
client) and Ethernet ports.
Protocols supported
Totalflow Remote / Local MMI
Totalflow / TCP
Modbus / TCP Server
Modbus / TCP Client
Modbus ASCII or RTU (Modicon, WordSwap, or
Danalyzer); DSFG
Totalflow Remote / Local MMI
Totalflow / TCP
Modbus / TCP Server
Modbus / TCP Client
Modbus ASCII or RTU (Modicon, WordSwap, or
Danalyzer)
Other specifications
•
•
•
sample streams.
•
• Four stream capability. Manual calibration required
•
•
•
stream.
•
• Calculations per compressibility calculation:
•
Sales Service Software
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Note on linearity of C6 through C9+
Extensive linearity testing is usually done to prove the design
of a GC. This has been done for the NGC8206 and the results
can be obtained in another datasheet. It is, however, doubtful
that the same data could be obtained for the “extended
to C9+.
The reasons for this are as follows:
• The wide concentration ranges needed to produce the
linearity data will themselves prevent building stable
calibration blends. When blends with more that 1000 ppm
(0.1 Mol %) of any of the C6, C7, C8, and C9+ components are
added to a blend, the Hydrocarbon Dew Point (HDP) of that
blend will tend to make it become a liquid unless kept and
sampled at a high temperature. Greater than 1000 ppm of
C6, C7, C8, or C9 increases the HDP to such a point the
mixture would have to be heated beyond 120F-140F to keep
the mixture a gas. This increases the difficulty of keeping or
sampling from the needed blends.
• The accuracy of a gravimetric calibration blend at these very
low mol % levels drops off significantly due to the very small
weights of the gases added. This leads to a much greater
error in the resulting mol % of each component and therefore
in the accuracy of the blend. This inaccuracy tends to make
the generation of the detector response curve meaningless.
However, the usable linear range of the detectors is quite
wide at the reasonable operating concentrations found in
these heavier fractions in comparison to the possible
variations in blend concentrations. So the NGC linearity will
likely exceed the real world requirements.
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– R
ev.
AI
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17—We reserve the right to make technical changes or modify the contents of this document
without prior notice. With regard to purchase orders, the agreed particulars shall prevail.
ABB does not accept any responsibility whatsoever for potential errors or possible lack
of information in this document.
We reserve all rights in this document and in the subject matter and illustrations contained
therein. Any reproduction, disclosure to third parties or utilization of its contents – in whole
or in parts – is forbidden without prior written consent of ABB.
© Copyright 2017 ABB.
All rights reserved.
—
ABB Inc.
Measurement & Analytics
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